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Finding the Fourth Proportional to 639,712.80, 959,914.80 and 265,773.60

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Solution

The fourth proportional to 639,712.80, 959,914.80 and 265,773.60 is: 398,803.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,712.80 : 959,914.80 = 265,773.60 : x
  2. Step 2: Convert to fraction form
    639,712.80/959,914.80 = 265,773.60/x
  3. Step 3: Cross multiply
    639,712.80x = 959,914.80 × 265,773.60
  4. Step 4: Simplify right side
    639,712.80x = 255,120,012,089.28
  5. Step 5: Solve for x
    x = 255,120,012,089.28/639,712.80
  6. Step 6: Final answer
    x = 398,803.98

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.